Engineering news formula for obtaining safe bearing capacity of pile for drop hammer, is, A. Q = Wh/6 (S + 2.5) B. Q = Wh/2.5 (S + 6) C. Q = (W × 6)/h (S + 2.5) D. Q = (W × 2.5)/6 (S + h)

The correct answer is: A. Q = Wh/6 (S + 2.5)

The Engineering News formula for obtaining safe bearing capacity of pile for drop hammer is:

Q = Wh/6 (S + 2.5)

where:

• Q = safe bearing capacity of pile (kN)
• W = weight of hammer (kN)
• h = height of drop (m)
• S = penetration of pile per blow (mm)

The formula is based on the assumption that the pile is driven into a homogeneous soil with a constant bearing capacity. The formula is conservative and should be used with caution in soils with variable bearing capacity.

Option B is incorrect because it uses the wrong value for the constant 2.5. Option C is incorrect because it uses the wrong units for the constant 6. Option D is incorrect because it uses the wrong order of the terms in the formula.